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Conservation and restoration of endangered aquatic macrophytes in brackish water zones

咸水区濒危水生植物的保护和恢复

基本信息

批准号：
12480163
负责人：
KUNII Hidenobu
金额：
$ 6.85万
依托单位：
Shimane University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12480163/
关键词：
Estuary Conservation ecology Endangered species Zostera japonica Carex rugulosa Aquatic macrophytes Seagrass Lakes Shinji and Nakaumi 絶滅危惧植物カワツルモ保全生態

项目摘要

In brackish Lakes Shinji and Nakaumi and its adjacent water bodies, we found several endangered species such as Ruppia maritima, Zannichellia palustris, Potamogeton pectinatus, Carex rugulosa, Potamogeton Panormitanus, Zostera japonica and Chara corallina var. kyushuensis. Although their conservation and restoration are currently needed, little is known for their life history traits. We thus started the observation on the life cycle and growth characteristics of two species, one Zostera japoncia, a seagrass growing in brackish water zones and the other Carex rugulosa, a brackish wetland plant. Concernign Z. japonica, it was shown that (1) the maximal depth limits relative to minimal light requirements was estimated to be 30% of the irradiance at the surface, provided that Secchi depth of the observation site was c.1.5m, (2) seasonal pattern of rhizome elongation rate was determined and maximum growth was observed during September-October when water temperature was 20-25 ℃, and the plant ceased to grow when water temperature decreased below 15 ℃, and (3) the plant was eurytopic against salinity. Concerning C.rugulosa, no germination was found under the dense canopy and population was maintained by the rhizome growth. It was estimated that the belowground biomass of this plant will decrease in competition with Phragmites australis due to the shading. We also examined the allozymic variation of several endangered aquatic macrophytes including these two plants in order to know the reproductive properties and effects of wave forces and transmitted waves on Z. japonica are also observed experimentally.

在新知湖和中海湖及其邻近水体中发现了一些濒危物种，如川蔓藻、泽氏藻、梳状眼子菜、虎尾苔草、宽叶眼子菜、大叶藻和轮藻。九州。虽然它们的保护和恢复是目前需要的，很少有人知道他们的生活史特征。因此，我们开始观察生活史和生长特性的两个物种，一个大叶藻，生长在半咸水区的海草和另一个苔草rugulosa，半咸水湿地植物。关注Z结果表明：（1）当观测点的Secchi深度为1.5m左右时，相对于最小需光量的最大深度限制为30%的表面辐照度;（2）确定了根茎伸长速率的季节变化规律，在水温为20-25 ℃的9 ~ 10月期间，根茎伸长速率最大，当水温低于15 ℃时，植株停止生长;（3）植株对盐度具有广适性。对于皱叶杜鹃，在茂密的树冠下没有发现萌发，种群通过根茎的生长来维持。在与芦苇的竞争中，由于遮荫，估计该植物的地下生物量将减少。为了了解波浪力和透射波对Z.在实验中也观察到了日本的一些特征。